Blow-off cock



(No Model.)

W. MGINTOSH.

BLOW-OFF COCK.

No. 603,043. Patented Apr, Z6, 1898.

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W'ILLIAM MCINTOSH, OF VVINONA, MINNESOTA.

BLOW-OFF COCK.

SPECIFICATION forming part ef Leners Patent No. 603,043, dated April 2e,189s.

i Application tiled Octoherll, 1897.

T0 LZ-Z whom, it may concern:

Be it known that I, WILLIAM MClNTosH, residing at Winona, in the countyof Winona and kState of Minnesota, have invented Improvements inBlow-Off Cocks, of which the following is a specification.

lily invention relates to blow-off cocks for boilers and the like; andits object is to provide for this purpose a device under the control ofany suit-able duid-pressure, which device shall, moreover, embody manynovel forms of construction and have many advantages in attachment andoperation.

My device maybe employed with advantage upon locomotives where anabundant supply of air-pressure is readily obtainable, although theboiler-pressure itself may be utilized for the operation of my device. Itherefore do not limit myself to the application of my invention tolocomotives nor to the employment of any speciiic fluid-pressure.

In the accompanying drawings, Figure lis a sectional elevation of myblow-off cock shown in position in a boiler-shell; Fig. 2, an elevationof my device; Fig. 3, a vievvr in elevation, showing my method of andmeans for screwingthe foundation-plug into place in the boiler-shell;and Fig. 4, a plan view of a portion of the foundation-plug.

In constructing my complete and preferable form of device I make what Iterm a foundation-plug l, to which is attached, as hereinafterexplained, the main valve-casing 2.

this foundation-plug and engage threads in any suitable blow-off port oropening in a boiler-shell a. This plug is further provided at its innerend and within the boiler with a yoke 5, having a central opening 6 toact as a guide for a valve-stem, as hereinafter set forth.

In order to form a seat for the valve adjacent to the blow-off port, aring is provided and is adapted to screw into the foundationplug. Thisring has lugs 8 upon its top face, which are adapted to be engaged by aSpannerwrench or other suitable means for screwing the seat in placewithin the plug.

A valve 9, which I will term inner valve, seats against the ring or seat7 and is provided with a stem l0, which, working in the Fig. l.

opening G in the yoke, guides the valve, there- Serial No. 654,850. (Nomodel.)

by insuring the central position of the valve and avoiding its liabilityto drop down from the seat ,when placed horizontally and after it hasbecome worn. This valve is` preferably, though not'necessarily, of thespiral win g type, as shown in the drawings.

The casing 2, ywhen placed in position upon the foundation-plug, formsor contains three chambers ll, l2, and 13, the iirst of which isadjacent to the blow-off port proper. The chambers ll and l2 areintercommunicating, and the passage therebetween is governed by a valvela, which is preferably circular and ts upon a cup-shaped seat l5. Thechamber l2 is provided with an outlet-passage 16, leading to theatmosphere.

The chamber 13 is a cylinder having its outer end closed by a removablehead or end plate 13, which is securely held in place by a clamping-ring13", which is clearly shown in The fluid-pressure mechanism foractuating the valve 14. operates in this cylinder and comprises apiston-head 17, provided with a preferably solid stem I8. The bottom ofthe cylinder has asocket or pocket formed by a depressed portion, withupwardly-extending walls 19, forming a sleeve through which thepiston-stem passes.

The valve 14, which may be termed the outer valve, is loosely andremovably mounted on the piston-stem in the following manner: The freeend of the stem is provided with a circular recess near the end to forman end shoulder 20, which is engaged by circular-shaped lan ges 2lpreferably integral with and extending from the valve-body 14e. Thedistance between the inner faces of these anges is the diameter of thepiston-stem at the recessed portion thereof, so that the iangespartially encompass the end of the stem and the end shoulder engagesunderneath the flanges. In order to center the valve and hold it inplace on the stem, I employ a screw 22, passing centrally through thevalve and having a reduced end or point 23 enteringa recess or hole inthe end of the stem.

The cylinder above the piston-head isa passage 24, leading through theend plate and communicating through pipe 25 with a source ofHuid-pressure, air, or steam, or any other suitable fluid-pressure,which is under the direct control of the engineer by any suitable ICClprovided with a flanged edge 28, which rests upon a similar flange 29at the top of the foundation-plug. In order to secure the parts rmlytogether, a coupling-ring 30, having a flange 3l engaging under theflange 29, is screwed upon the casing 2. By this means thedischarge-opening 1G may be brought or adjusted to any desired position,which is im- .possible if the casing screws upon the plug.

The coupling-ring is so made as to be readily engaged by aSpanner-wrench, although any other suitable means for securing the samemay be adopted. As shown in Fig. 1, a recesschamber 32, having anannular depression or groove 33, is provided near the dischargeopeningfor the purpose of receiving any leakage of water, the. from the valvedevice. This depression will collect such leakage and dispose of itthrough a drip-hole 34, which is located atthe lowestpoint,dependent,ofcourse, -upon the position of the blow-off opening when applied to theboiler.

In Fig. 3 I have illustrated the following means for securely screwingthe plug in the boiler and for removing it therefrom. The plug has twooppositely-disposed internal recesses 35, which are adapted to receivetwo lugs 38 upon what I term a disk nut 36, having a square or otherwiseangular head 37, so as to be capable of being turned with an ordinarywrench, and is clamped to the plug by means of the clamping-ring 30.When the parts are assembled as shown in Fig. 3, the plug can be easilyand securely screwed into the boiler and as easily removed by reason ofthe attachment of the disk nut thereto, whereby a powerful means ofscrewing the plug into the boiler is provided. Vhen so secured, the ringmay be unscrewed and the disk nut removed therefrom, whereupon thecasing 2 is placed in proper position on the plug and thedischarge-opening adjusted in the proper direction,dependentupon theplace of use, or as may be otherwise desired, after which theclamping-ring 30 is screwed up to couple the parts together.

My device operates as follows: When it is desired to blow off theboiler, air, steam, or

any other suitable Huid-pressure is admitted through supply-pipe 25 tocylinder 18, moving the piston and stem downward and forcing the valve14 from its seat. After a slight initialmovement of suoli valve the headof the bolt or screw 22 strikes the inner valve and forces it from itsseat, whereby an opening is made from the boiler through chambers 11 and12 and out to the atmosphere through the discharge-passage` 16. When thepressure on the piston is released, the sprin g seats the outer valve,while the boiler-pressure seats the inner valve, these valves preferablyseating independently. I provide the duplex valves for safety, as it isobvious that the upper casing maybe broken off from the plug,leaving theinner valve to close the blowoff port; but it is apparent that the innervalve could be dispensed with and that such valve could be connected tothe piston-stem and the outer valve be dispensed with, although for 'allpracticalv purposes it is preferable to employ the duplex valve seatingindependently, as shown and described.

I prefer to make the end plate or cap of the cylinder removable and toclamp it into position, as shown, so that it may be adjusted indifferent positions to allow the opening for admission of pressure to beadjusted. If this opening or supply-port was in the center of theplate,such adjustment would be unnecessary; but as it is desired to usethe center 1 for other purposes the supply-port is located nearer theedge or rim of the cap and a clam ping-ring is employed, so that themain casing can be changed to any position without disturbing theposition of the cap as related to the supply-pipes.

Although I have described or shown more or less precise forms anddetails of construction,I do not intend to be understood as limit- I ingmyself thereto, as I contemplate changes in form, proportion of parts,and the substitution of equivalents as circumstances may suggest orrender expedient and without departing from the spirit and scope of myinvention and claims.

I claim- 1. In a blow-off cock, the combination of a valve-casing havingcommunication with a boiler and the atmosphere, a fluid-pressureactuatedpiston in the casing, a stem for the piston and a valve controlled bythe piston and governing the passage through the casing from the boilerto the atmosphere, such valve being removably secured to the pistonstemand having a substantially universal adjustment thereon.

2. Ina blow-off cock, the combination of a valve-casing having a passagefrom a boiler to the atmosphere, a tluid-pressure-actuated piston in thecasing, a stem therefor, a valve controlling said passage and removablyconnected to the piston-stem and having a movement thereon, and aremovable seat on which the valve seats.

3. In a blow-off cock for a boiler and the like, the combination of avalve-casing having a passage from a boiler to the atmosphere, andformed in two parts, a fluid-pressure-actuated piston in the casing, avalve controlled by the piston and governing said passage, means forclamping the parts of the casing together, and a removable invertedcup-shaped seat within the casing on which the valve lOO los

IIO

seats, such seat being held in place by said clamping means.

fl. In a blow-oit cock for a boiler and the like, the combination of ahollow plug adapted to be secured in the blow-olf port of a boiler, acasing having a passage from the boiler to the atmosphere, a removablevalveseat having an annular flange adapted to be held between the casingand plug, means for securing said parts together, a valve governing saidpassage and adapted to fit upon such seat and means for actuating saidvalve.

5. In a blow-off cock for a. boiler and the like, the combination of ahollow plug 1 adapted to be secured to the blow-off port of a boiler, acasing 2 having a passage from the boiler to the atmosphere, a removablevalveseat 15 having an annular flange adapted to be held between thecasing and plug, a clamping-ring 30 adapted to secure the plug, casingand annular flange together, a valve 14 governing the said passage andiitting upon said seat, a pist-011 17 having a stem 1S actuating saidvalve and a sprin g 27 for normally holding the valve seated.

6. A blow-oit cock comprisin ga foundationplug secured in the blow-oftport of a boiler, a valve-Casin g providing, in conjunction with theplug, a passage-way from the boiler to the atmosphere through adischarge-port in the casing, valve mechanism governing suchpassage-way, a removable valve-seat and a ring for clamping the plug andcasing together and permitting the casing to be adjusted and secured tothe plug so as to discharge to the atmosphere in any desired direction.

7. In a blow-oil' cock, the combination of a casing, a valve therein fornormally closing the blow-off port and having a depending stem, meansfor operating the valve, and a yoke or frame connected to the casing andhaving a guide to receive the depending valvestem.

8. A blow-oft cock comprisinga foundationplug secured in the blow-offport of a boiler, a valve-casing providing, in conjunction with theplug, a passage-Way from the boiler to the atmosphere through adischarge-port in the casing, valve mechanism governing suchpassage-way, a removable valve-seat and means for clamping the plug andcasing together and holding the removable valve-seat in place.

9. In a blow-oftcock for a boiler and the like, the combination of acasing communicatin g with the boiler, a valve therein for governingsuch communication and having an extended stem 10, a yoke 5 connected toend of the casing Within the boiler and provided with a central openingG adapted to receive and guide the stem 10 and means for actuating thevalve.

10. In a blow-olf cock, the combination of a casing in two sections, onesection being secured in the blow-o port, a coupling-ring for clampingor connecting the sections together,

a valve in the casing for normally closing the blow-oil? port and meansfor operating the valve.

11. In a blow-oft cock, the combination of a valve-casing in twosections, one being the outer section and the other the inner orfoundation-plug, the casing having a passage'from the blow-oilc port tothe atmosphere and also having a cylinder, a piston therein having astem, a valve for governing said passage, means for removably securingthe valve to the stem, and a second valve governing the blow-oit portand adapted to be unseated by contact with the iirst valve.

12. The combination of a valve, a stein therefor and means for removablysecuring the valve to the stem comprising ilanges or extensions on thevalve engaging the stem, and a bolt passing through the valve andcontacting the stem for retaining the valve upon the stem.

13. The means for removably securing a valve to a stem comprising ashoulder on the stem, an extension on the valve for engaging theshoulder and a bolt passing through the valve and entering the stem.

14. The means for removably securing a valve to a stem comprising an endshoulder on the stem and having a central hole or recess in its end, twosubstantially semicircular flanges partially encompassing the stem andengaging the end shoulder and a screwbolt passing through the valve-body and entering the hole in the end of the stem.

15. The means for removably securing a valve toa stem comprising an endshoulder 2O on the stem and having an end hole or rel cess, circularflanges 21 extending from vthe valve and whose inner faces are separateda distance equal to the diameter of the stem above the end shoulder anda screw-bolt 22 having a reduced end or point 23 entering the hole inthe end of the stem.

16. In a blow-oft cock, the combination of a casing having a passagefrom the boiler to the atmosphere, a iluid-pressure-actuated piston inthe casing, a stem therefor having an end shoulder, a valve controllingsaid passage and provided with an extension engaging the shoulder, and ascrew-bolt passing through the valve-body and entering the stem.

17. In a blow-oit cock, the combination of a casing having a passagefrom the boiler to the atmosphere, a iiuid-pressure-actuated piston, astem therefor having a shoulder and end recess, a valve controlling saidpassage and having flanges engaging the shoulder and a bolt with areduced end, the bolt passing through the valve and entering the recess.

1S. In a blow-oit cock, the combination of a casing having a passagefrom a boiler to the atmosphere and also having a cylinder, a pistontherein, a piston-stem integral therewith, a valve governing' theblow-od port, a second ICO IIO

IIS

valve removably connected to the stem for I9. In a blow-off cock, thecombination of a valve-casing secured in a blow-olif port of a boilerand having a passage therefrom to the atmosphere, an inner valve in thecasing and seated upon the blow-off port proper, means for guiding suchvalve, an outer valve also in the casing and governing said passagetothe atmosphere, and fluid -pressure mechanism for operating the valvesand comprising a piston and a stem removably connected With the outervalve said outer valve having a substantially universal movement on itsstem.

20. In a blow-off cock, the combination of a valve-casing in twosections, one being the outer section and the other the inner orfoundation-plug, the casin g having a passage from the boiler to theatmosphere, and also having a cylinder, a piston located in the cylinderand having a siem, a valve removably secured to the stem and governingsaid passage, a second valve also governing such passage and adapted tobe operated by the movement of the first valve, a yoke upon the plugWithin the boiler and having a central opening and a stem upon thesecond valve adapted to be received by the central opening in the yoke.

21. In a blow-off cock, the combination of a valve-casing having apassage from the boiler to the atmosphere and also having a cylinder,Valve mechanism for governing said passage, fluid-pressure mechanism foractuating the valve mechanism, a removable end plate or head for thecylinder and a clampingring for securing the end plate to the casing.

22. The combination With a boiler and the like, of a foundation-plu gsecured in the boiler blow-off port, a casing communicating with theplug and forming therewith a passage from the boiler to the atmospherethrough a discharge opening at one side of the casing, valve mechanismWithin the casing for regulating said passage and means for securing thecasing upon the plug in any adjusted position.

WILLIAM MCINTOSH. Vitnesses:

M. A. BROOKS, J. F. FLEIsCHER.

